Crush The Can - Revision history

imported>Stwikiadmin: /* Why This Works */

2016-04-08T16:03:23Z

Why This Works

← Older revision		Revision as of 16:03, 8 April 2016
Line 37:		Line 37:

	== Why This Works ==		== Why This Works ==

	~~===Short Explanation===~~

	Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't notice how strong air pressure really is, since our bodies push back and we stay un-smashed. But, we can see the effects by using this can.		Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't notice how strong air pressure really is, since our bodies push back and we stay un-smashed. But, we can see the effects by using this can.

	When we heated the water in the can, we made it boil, and start to evaporate. Liquids take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, leaving steam and boiling water in the can. The walls of the can could push back while it had gas (steam) inside to push against the gas (air) outside. When the can was flipped into the water, the steam inside of it condensed back to a liquid. This left a lot of empty space in the can, which we call a ''vacuum''. Since we had no gas left inside the can, the gas outside could then exert a lot of pressure on the can and crush it!		When we heated the water in the can, we made it boil, and start to evaporate. Liquids take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, leaving steam and boiling water in the can. The walls of the can could push back while it had gas (steam) inside to push against the gas (air) outside. When the can was flipped into the water, the steam inside of it condensed back to a liquid. This left a lot of empty space in the can, which we call a ''vacuum''. Since we had no gas left inside the can, the gas outside could then exert a lot of pressure on the can and crush it!

	~~===Full Explanation===~~
	~~'''''COMING SOON'''''~~

	== Additional Information ==		== Additional Information ==

imported>Stwikiadmin: /* Demonstration */

2016-03-02T15:29:27Z

Demonstration

← Older revision		Revision as of 15:29, 2 March 2016
Line 32:		Line 32:
	Preparation: Fill the bowl with water, and set the small blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder. Put on the safety glasses and heat gloves.		Preparation: Fill the bowl with water, and set the small blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder. Put on the safety glasses and heat gloves.

	1. Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.		# Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.
			# Once the water starts to boil, have the assembly give a countdown. At the end of the countdown, flip the soda can, open end first, into the bowl of water. It should crush!
	2. Once the water starts to boil, have the assembly give a countdown. At the end of the countdown, flip the soda can, open end first, into the bowl of water. It should crush!		# Turn off the blowtorch, and lift the soda can out of the bowl, allowing the water to drain. Wear the gloves while removing the can from the holder, as it may still be hot.

	3. Turn off the blowtorch, and lift the soda can out of the bowl, allowing the water to drain. Wear the gloves while removing the can from the holder, as it may still be hot.

	== Why This Works ==		== Why This Works ==

imported>Stwikiadmin: /* Why This Works */

2016-03-01T14:22:02Z

Why This Works

← Older revision		Revision as of 14:22, 1 March 2016
Line 40:		Line 40:
	== Why This Works ==		== Why This Works ==

	Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't normally notice the effect of the air pressure around us, but we can by using this can.		===Short Explanation===

	When we heated the water in the can, we made it boil and start to evaporate. ~~liquids~~ take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, ~~meaning that it only had~~ steam and water ~~inside~~ of it ~~while~~ the ~~water was boiling in the can~~. When the can was ~~then~~ flipped into the water, the steam inside of it condensed back to a liquid. This left a lot of empty space in the can, which we call a ''vacuum''. ~~The walls of the can could push back while it had gas inside to push against the gas outside. But, when~~ we had no gas left inside the can, the gas outside the can ~~was able to~~ crush it!		Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't notice how strong air pressure really is, since our bodies push back and we stay un-smashed. But, we can see the effects by using this can.

			When we heated the water in the can, we made it boil, and start to evaporate. Liquids take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, leaving steam and boiling water in the can. The walls of the can could push back while it had gas (steam) inside to push against the gas (air) outside. When the can was flipped into the water, the steam inside of it condensed back to a liquid. This left a lot of empty space in the can, which we call a ''vacuum''. Since we had no gas left inside the can, the gas outside could then exert a lot of pressure on the can and crush it!

			===Full Explanation===
			'''''COMING SOON'''''

	== Additional Information ==		== Additional Information ==

imported>Stwikiadmin: /* Demonstration */

2016-03-01T14:13:18Z

Demonstration

← Older revision		Revision as of 14:13, 1 March 2016
Line 30:		Line 30:
	== Demonstration ==		== Demonstration ==

	~~Prepare the demonstration~~: Fill the bowl with water, and set the blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder. Put on the safety glasses and heat gloves.		Preparation: Fill the bowl with water, and set the small blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder. Put on the safety glasses and heat gloves.

	1. Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.		1. Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.
Line 37:		Line 37:

	3. Turn off the blowtorch, and lift the soda can out of the bowl, allowing the water to drain. Wear the gloves while removing the can from the holder, as it may still be hot.		3. Turn off the blowtorch, and lift the soda can out of the bowl, allowing the water to drain. Wear the gloves while removing the can from the holder, as it may still be hot.


	== Why This Works ==		== Why This Works ==

imported>Stwikiadmin at 16:51, 22 September 2015

2015-09-22T16:51:25Z

← Older revision		Revision as of 16:51, 22 September 2015
Line 1:		Line 1:
	{\| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"		{\| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"
	\| [[Physics:]]		\| [[Physics]]:
	\| Pressure, Vacuums		\| Pressure, Vacuums
	\|-		\|-

imported>Stwikiadmin at 16:49, 22 September 2015

2015-09-22T16:49:29Z

← Older revision		Revision as of 16:49, 22 September 2015
Line 1:		Line 1:
	;[[Physics]]: Pressure, Vacuums		{\| class="wikitable" style="color:black; background-color:#ddd; margin-left: auto; float:right"
	;Grade Range: [[Elementary School]], [[Middle School]], [[High School]]		\| [[Physics:]]
	;Format: [[Stage]]		\| Pressure, Vacuums
			\|-
			\| Grade Range:
			\| [[Elementary School]], [[Middle School]], [[High School]]
			\|-
			\| Format:
			\| [[Stage]]
			\|}

			This demonstration is an exciting way to see how the air around us pushes on everything! We take a soda can and, by simply boiling water inside of it, we are able to get the air around us to crush the can! This demonstration works well for all ages, and can be adjusted to the age group easily.

	== Materials ==		== Materials ==

imported>Stwikiadmin: /* Materials */

2015-09-04T14:12:21Z

Materials

← Older revision		Revision as of 14:12, 4 September 2015
Line 5:		Line 5:
	== Materials ==		== Materials ==

	* An empty aluminum soda can		* An empty aluminum soda can
	* Bowl with water		* Bowl with water
	* Heat resistant gloves		* Heat resistant gloves
	* Propane torch		* Propane torch
	* Can holder (ring shaped holder)		* Can holder (ring shaped holder)
	* Small blast shield		* Small blast shield

	== Safety Precautions ==		== Safety Precautions ==

imported>Morganp: /* Why This Works */

2015-09-04T01:37:07Z

Why This Works

← Older revision		Revision as of 01:37, 4 September 2015
Line 34:		Line 34:
	Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't normally notice the effect of the air pressure around us, but we can by using this can.		Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't normally notice the effect of the air pressure around us, but we can by using this can.

	When we heated the water in the can, we made it evaporate~~, or go from a liquid to a gas state~~. liquids take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, meaning that it only had steam and water inside of it ~~when~~ the water was boiling in the can. When the can was then flipped into the water, the steam inside of it condensed back to a liquid ~~state~~. This left a lot of empty space in the can, which we call a ''vacuum''. The walls of the can could push back while it had gas inside to push against the gas outside. But, when we had no gas left inside the can, the gas outside the can was able to crush it!		When we heated the water in the can, we made it boil and start to evaporate. liquids take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, meaning that it only had steam and water inside of it while the water was boiling in the can. When the can was then flipped into the water, the steam inside of it condensed back to a liquid. This left a lot of empty space in the can, which we call a ''vacuum''. The walls of the can could push back while it had gas inside to push against the gas outside. But, when we had no gas left inside the can, the gas outside the can was able to crush it!


	== Additional Information ==		== Additional Information ==

imported>Stwikiadmin at 18:04, 3 September 2015

2015-09-03T18:04:01Z

← Older revision		Revision as of 18:04, 3 September 2015
Line 21:		Line 21:
	== Demonstration ==		== Demonstration ==

	Prepare the demonstration: Fill the bowl with water, and set the blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder.		Prepare the demonstration: Fill the bowl with water, and set the blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder. Put on the safety glasses and heat gloves.

	1. Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.		1. Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.

imported>Stwikiadmin at 17:05, 3 September 2015

2015-09-03T17:05:41Z

← Older revision		Revision as of 17:05, 3 September 2015
Line 1:		Line 1:
	~~== Age ==~~		;[[Physics]]: Pressure, Vacuums
			;Grade Range: [[Elementary School]], [[Middle School]], [[High School]]
	Elementary School, Middle School, High School		;Format: [[Stage]]

	== Format ==

	Stage ~~Show~~

	== Materials ==		== Materials ==

	An empty aluminum can		* An empty aluminum soda can
	~~a small aquarium filled~~ with water		* Bowl with water
	~~heat~~ resistant gloves		* Heat resistant gloves
	~~propane~~ torch		* Propane torch
	a ring ~~to hold the can~~		* Can holder (ring shaped holder)
	~~small~~ blast shield		* Small blast shield

	== Safety Precautions ==		== Safety Precautions ==

	~~Science Theatre demonstrators must keep~~ the ~~safety~~ of ~~themselves and their audience in mind at all times. All Science Theatre demonstrators must have read through~~ the Safety ~~Training~~ page. The ST Safety Box with first aid kit, fire extinguisher, etc. should always be available to demonstrators. Always wear safety gloves, glasses, and a labcoat if handling chemicals; always perform potentially dangerous demonstrations at a safe distance from the audience; and always keep a very close eye on any volunteers you call from the audience. This demonstration uses a propane torch, thus there is a hot flame. You must have the fire extinguisher at hand. Make sure the audience is far enough away. When you turn the can upside down to put it in the water, make sure not to splash anyone (this should be easy to avoid but its important to be aware of the possibility and be careful). Moreover you must be wearing the heat resistant gloves, a lab coat, and goggles. Hold the end of the ring with which you are holding the can to keep the distance between the flame and you a maximum. You should put up the small blast shield in front of the aquarium.		Please read the Fire Demonstration Safety and Loud Demonstration Safety sections of the [[Demonstration Safety]] page before performing this demonstration.

	~~== Preparation ==~~		This demonstration requires: safety glasses, heat gloves, fire extinguisher, blast shield

	Before the show, fill the aquarium 2/3 or so with water. It’s an awkward size and shape, so you’ll need a larger sink if you can find one. If one is not at hand, it may be necessary to use a smaller container to collect water which can be poured into aquarium. It would be helpful to assemble the torch by connecting the fuel container to the torch by simply twisting it tightly, but do not turn it on yet. Put the shield in front of the aquarium.

	== Demonstration ==		== Demonstration ==

	Fill the ~~can~~ with ~~3 centimeters~~ of water. ~~It is best to listen to~~ the ~~water as you shake~~ the can ~~gently~~. ~~You should hear~~ and ~~feel some water~~ moving in the can, ~~but not an amount that makes it substantially heavier~~.		Prepare the demonstration: Fill the bowl with water, and set the blast shield in front of the bowl. Put a small amount of water in the can, measuring less than an inch deep inside the can (approximately 10mL). Set the can in the ring holder.

			1. Hold the can holder in one hand, and the blowtorch in the other. Turn on the blowtorch, and heat the bottom of the can, moving the blowtorch flame in a small circle.

			2. Once the water starts to boil, have the assembly give a countdown. At the end of the countdown, flip the soda can, open end first, into the bowl of water. It should crush!

	~~Put the can through the ring~~. ~~Put on~~ the ~~heat resistant gloves~~, ~~attach the torch to the fuel container if not yet done~~ and ~~turn the switch on the side of the torch to its “on” position. Holding~~ the can ~~with the ring and the torch with the other, position the torch so that it is aimed toward the bottom~~ of the ~~can~~, ~~but not your fingers, your body, or~~ the ~~audience~~. ~~Holding down~~ the ~~trigger of the torch begin to heat the bottom of~~ the can~~. Try to evenly distribute~~ the ~~heat~~, ~~not focusing on one spot, so that you do not burn a hole through the can~~.		3. Turn off the blowtorch, and lift the soda can out of the bowl, allowing the water to drain. Wear the gloves while removing the can from the holder, as it may still be hot.

	Soon the water will begin to boil (maybe a minute or so). You will feel the water boiling, possibly hear it, and begin to see substantial amounts of water vapor leaving the can. Once it begins to boil, wait awhile, maybe 15-30 seconds, continuing to heat evenly. Now putting down the torch, move the can toward the aquarium. In a smooth motion, making sure not to spill any remaining water on the audience, turn the can upside down into the water. The can must be upside prior to entering the water but don’t do it too soon. The can will implode if you did it right. Let the can sit in the water. Turn of the torch, detach it from the container and take off the gloves.

	== ~~What to Say~~ ==		== Why This Works ==

	~~Ask the audience what they think will happen if you heat~~ a ~~can of water~~. If the ~~answer is not given, explain~~ that ~~eventually~~ the water will boil and water vapor will fill the can, escaping through the opening. Then ask them what they think will happen if they put a can full of water vapor into a cold container of water. Now begin the demo. As you set up the safety equipment, comment on ~~why you are doing what you are doing-gloves to protect you from the flame, the shield to protect the audience, etc~~. ~~As the can heats, explain what’s going on-~~ the ~~water molecules are gaining energy. When it begins to boil comment~~ of the ~~water vapor (it’s not steam) that is escaping. When you are about to turn the~~ can ~~over, comment on the fact that much of the water is now water vapor and has either escaped or has filled the~~ can ~~and is moving around energetically~~.		Pressure is when a force is applied over an area. Air pressure refers to the force that the air around us is constantly applying on us. We don't normally notice the effect of the air pressure around us, but we can by using this can.

	~~After~~ the can ~~implodes~~, ~~ask what happened~~. ~~Tell them that when~~ the ~~can was placed~~ in ~~the water~~, the ~~water vapor condensed into water. Say that this caused~~ a ~~change in pressure~~ that ~~happened so quickly the~~ can ~~imploded~~. ~~Prior~~ to ~~entering~~ the ~~water~~, ~~the can was being pushed from the outside by the air~~ and ~~the~~ inside by the water ~~vapor~~. ~~Once in~~ the water, ~~when~~ the ~~vapor was quickly~~ condensed, ~~only~~ the ~~pressure of~~ the ~~water remained on~~ the can, ~~pushing inward. Because this change happened so suddenly,~~ the can ~~imploded.~~		When we heated the water in the can, we made it evaporate, or go from a liquid to a gas state. liquids take the shape of the container they are in, while gases take up all of the space within a container that they can. The steam caused the rest of the air to leave the can, meaning that it only had steam and water inside of it when the water was boiling in the can. When the can was then flipped into the water, the steam inside of it condensed back to a liquid state. This left a lot of empty space in the can, which we call a ''vacuum''. The walls of the can could push back while it had gas inside to push against the gas outside. But, when we had no gas left inside the can, the gas outside the can was able to crush it!

	~~== Why It Is ==~~

	When the can is heated it becomes filled with water vapor. This vapor occupies approximately 1000 times more space than it did as a liquid. When you turn the can over into the cool water the water vapor turns back to liquid water very quickly creating a partial vacuum in the can.		== Additional Information ==

	~~== Real Life Examples ==~~		* This demonstration benefits from being performed twice in a row. The first time is to show the students and get them thinking, the second time is to explain the different parts of the experiment.
			* This demonstration is a part of the [[Pressure Show]].